Phase Lock Error
(USE
WITH
SPECTRUM
ANALYZER)
GIGITIZING
OX
I LLOSCOPE
HP
8753E
i
EXT
NETWORK
REF
ANALYZER
INPUT
10
MHz
,
i
SPECTRUM
OUT
ANALYZER
I
I /
I
I I
,
I
/
,
,
I
I
I I
I
I I
\
A
J
.------------
_
------------~_-__________
sg652e
Figure 7-1. Basic Phase Lock Error Troubleshooting Equipment Setup
Troubleshooting tools include the assembly location diagram and phase lock
diagnostic tools. The assembly location diagram is on the underside of the
instrument top cover. The diagram shows major assembly locations and
RF
cable
connections. The phase lock diagnostic tools are explained in the “Source Group
Troubleshooting Appendix” and should be used to troubleshoot phase lock
problems The equipment setup shown in Figure
7-l
can be used throughout this
chapter.
Phase Lock Loop Error Message Check
Phase lock error messages may appear as a result of incorrect pretune
correction constants. To check this possibility, perform the
pretune correction
constants routine.
The four phase lock error messages, listed below, are described in the “Source
Group Troubleshooting Appendix” at the end of this chapter.
n
NO
IFFOUND:
CHECK R INPUT LEVEL
n
NO PHASE LOCK: CHECK R INPUT LEVEL
n
PHASE LOCK CAL FAILED
74 Source Troubleshooting
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